Leviticus 13:40

קרח הוא טהור הוא HE IS BALD, HE IS CLEAN — clean from the uncleanness of נתק (a scall in a hairy spot) (Sifra, Braita d'Rabbi Yishmael 15), for he is not subject to the law about the symptoms of the head or the beard, which are places where hair grows, but to that about the symptoms of a plague on the skin of the flesh — [white hair], healthy flesh or the spreading of the plague.

וְאִ֕ישׁ כִּ֥י יִמָּרֵ֖ט רֹאשׁ֑וֹ קֵרֵ֥חַ ה֖וּא טָה֥וֹר הֽוּא׃

And the man whose hair is fallen off his head, he is bald; yet is he clean.